diff --git a/docs/manual/adding-packages-generic.txt b/docs/manual/adding-packages-generic.txt
index d264f40..d3a4abb 100644
--- a/docs/manual/adding-packages-generic.txt
+++ b/docs/manual/adding-packages-generic.txt
@@ -311,6 +311,13 @@ different steps of the build process.
* +LIBFOO_UNINSTALL_STAGING_CMDS+, used to list the actions to
uninstall the package from the staging directory +$(STAGING_DIR)+.
+* +LIBFOO_INSTALL_INIT_SYSV+ and +LIBFOO_INSTALL_INIT_SYSTEMD+, used
+ to install init scripts either for the systemV-like init systems
+ (busybox, sysvinit, etc.) or for the systemd units. These commands
+ will be run only when the relevant init system is installed (i.e. if
+ systemd is selected as the init system in the configuration, only
+ +LIBFOO_INSTALL_INIT_SYSTEMD+ will be run).
+
The preferred way to define these variables is:
----------------------